crypto/ec/ec_asn1.c

   1 /*
   2  * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * ECDSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <string.h>
  17 #include "ec_local.h"
  18 #include <openssl/err.h>
  19 #include <openssl/asn1t.h>
  20 #include <openssl/objects.h>
  21 #include "internal/nelem.h"
  22 #include "crypto/asn1.h"
  23 #include "crypto/asn1_dsa.h"
  24
  25 #ifndef FIPS_MODULE
  26
  27 /* some structures needed for the asn1 encoding */
  28 typedef struct x9_62_pentanomial_st {
  29     int32_t k1;
  30     int32_t k2;
  31     int32_t k3;
  32 } X9_62_PENTANOMIAL;
  33
  34 typedef struct x9_62_characteristic_two_st {
  35     int32_t m;
  36     ASN1_OBJECT *type;
  37     union {
  38         char *ptr;
  39         /* NID_X9_62_onBasis */
  40         ASN1_NULL *onBasis;
  41         /* NID_X9_62_tpBasis */
  42         ASN1_INTEGER *tpBasis;
  43         /* NID_X9_62_ppBasis */
  44         X9_62_PENTANOMIAL *ppBasis;
  45         /* anything else */
  46         ASN1_TYPE *other;
  47     } p;
  48 } X9_62_CHARACTERISTIC_TWO;
  49
  50 typedef struct x9_62_fieldid_st {
  51     ASN1_OBJECT *fieldType;
  52     union {
  53         char *ptr;
  54         /* NID_X9_62_prime_field */
  55         ASN1_INTEGER *prime;
  56         /* NID_X9_62_characteristic_two_field */
  57         X9_62_CHARACTERISTIC_TWO *char_two;
  58         /* anything else */
  59         ASN1_TYPE *other;
  60     } p;
  61 } X9_62_FIELDID;
  62
  63 typedef struct x9_62_curve_st {
  64     ASN1_OCTET_STRING *a;
  65     ASN1_OCTET_STRING *b;
  66     ASN1_BIT_STRING *seed;
  67 } X9_62_CURVE;
  68
  69 struct ec_parameters_st {
  70     int32_t version;
  71     X9_62_FIELDID *fieldID;
  72     X9_62_CURVE *curve;
  73     ASN1_OCTET_STRING *base;
  74     ASN1_INTEGER *order;
  75     ASN1_INTEGER *cofactor;
  76 } /* ECPARAMETERS */ ;
  77
  78 typedef enum {
  79     ECPKPARAMETERS_TYPE_NAMED = 0,
  80     ECPKPARAMETERS_TYPE_EXPLICIT,
  81     ECPKPARAMETERS_TYPE_IMPLICIT
  82 } ecpk_parameters_type_t;
  83
  84 struct ecpk_parameters_st {
  85     int type;
  86     union {
  87         ASN1_OBJECT *named_curve;
  88         ECPARAMETERS *parameters;
  89         ASN1_NULL *implicitlyCA;
  90     } value;
  91 } /* ECPKPARAMETERS */ ;
  92
  93 /* SEC1 ECPrivateKey */
  94 typedef struct ec_privatekey_st {
  95     int32_t version;
  96     ASN1_OCTET_STRING *privateKey;
  97     ECPKPARAMETERS *parameters;
  98     ASN1_BIT_STRING *publicKey;
  99 } EC_PRIVATEKEY;
 100
 101 /* the OpenSSL ASN.1 definitions */
 102 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
 103         ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
 104         ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
 105         ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
 106 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
 107
 108 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 109 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
 110
 111 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
 112
 113 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
 114         ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
 115         ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
 116         ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
 117 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
 118
 119 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
 120         ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
 121         ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
 122         ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
 123 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
 124
 125 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 126 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
 127
 128 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
 129
 130 ASN1_ADB(X9_62_FIELDID) = {
 131         ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
 132         ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
 133 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
 134
 135 ASN1_SEQUENCE(X9_62_FIELDID) = {
 136         ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
 137         ASN1_ADB_OBJECT(X9_62_FIELDID)
 138 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
 139
 140 ASN1_SEQUENCE(X9_62_CURVE) = {
 141         ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
 142         ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
 143         ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
 144 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
 145
 146 ASN1_SEQUENCE(ECPARAMETERS) = {
 147         ASN1_EMBED(ECPARAMETERS, version, INT32),
 148         ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
 149         ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
 150         ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
 151         ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
 152         ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
 153 } ASN1_SEQUENCE_END(ECPARAMETERS)
 154
 155 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 156 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
 157
 158 ASN1_CHOICE(ECPKPARAMETERS) = {
 159         ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
 160         ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
 161         ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
 162 } ASN1_CHOICE_END(ECPKPARAMETERS)
 163
 164 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
 165 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
 166 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
 167
 168 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
 169         ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
 170         ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
 171         ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
 172         ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
 173 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
 174
 175 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 176 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
 177 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
 178
 179 /* some declarations of internal function */
 180
 181 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
 182 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
 183 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
 184 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
 185
 186 /* the function definitions */
 187
 188 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
 189 {
 190     int ok = 0, nid;
 191     BIGNUM *tmp = NULL;
 192
 193     if (group == NULL || field == NULL)
 194         return 0;
 195
 196     /* clear the old values (if necessary) */
 197     ASN1_OBJECT_free(field->fieldType);
 198     ASN1_TYPE_free(field->p.other);
 199
 200     nid = EC_GROUP_get_field_type(group);
 201     /* set OID for the field */
 202     if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
 203         ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
 204         goto err;
 205     }
 206
 207     if (nid == NID_X9_62_prime_field) {
 208         if ((tmp = BN_new()) == NULL) {
 209             ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 210             goto err;
 211         }
 212         /* the parameters are specified by the prime number p */
 213         if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
 214             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 215             goto err;
 216         }
 217         /* set the prime number */
 218         field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
 219         if (field->p.prime == NULL) {
 220             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 221             goto err;
 222         }
 223     } else if (nid == NID_X9_62_characteristic_two_field)
 224 #ifdef OPENSSL_NO_EC2M
 225     {
 226         ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
 227         goto err;
 228     }
 229 #else
 230     {
 231         int field_type;
 232         X9_62_CHARACTERISTIC_TWO *char_two;
 233
 234         field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
 235         char_two = field->p.char_two;
 236
 237         if (char_two == NULL) {
 238             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 239             goto err;
 240         }
 241
 242         char_two->m = (long)EC_GROUP_get_degree(group);
 243
 244         field_type = EC_GROUP_get_basis_type(group);
 245
 246         if (field_type == 0) {
 247             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 248             goto err;
 249         }
 250         /* set base type OID */
 251         if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
 252             ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
 253             goto err;
 254         }
 255
 256         if (field_type == NID_X9_62_tpBasis) {
 257             unsigned int k;
 258
 259             if (!EC_GROUP_get_trinomial_basis(group, &k))
 260                 goto err;
 261
 262             char_two->p.tpBasis = ASN1_INTEGER_new();
 263             if (char_two->p.tpBasis == NULL) {
 264                 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 265                 goto err;
 266             }
 267             if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
 268                 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 269                 goto err;
 270             }
 271         } else if (field_type == NID_X9_62_ppBasis) {
 272             unsigned int k1, k2, k3;
 273
 274             if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
 275                 goto err;
 276
 277             char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
 278             if (char_two->p.ppBasis == NULL) {
 279                 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 280                 goto err;
 281             }
 282
 283             /* set k? values */
 284             char_two->p.ppBasis->k1 = (long)k1;
 285             char_two->p.ppBasis->k2 = (long)k2;
 286             char_two->p.ppBasis->k3 = (long)k3;
 287         } else {                /* field_type == NID_X9_62_onBasis */
 288
 289             /* for ONB the parameters are (asn1) NULL */
 290             char_two->p.onBasis = ASN1_NULL_new();
 291             if (char_two->p.onBasis == NULL) {
 292                 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 293                 goto err;
 294             }
 295         }
 296     }
 297 #endif
 298     else {
 299         ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
 300         goto err;
 301     }
 302
 303     ok = 1;
 304
 305  err:
 306     BN_free(tmp);
 307     return ok;
 308 }
 309
 310 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
 311 {
 312     int ok = 0;
 313     BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
 314     unsigned char *a_buf = NULL, *b_buf = NULL;
 315     size_t len;
 316
 317     if (!group || !curve || !curve->a || !curve->b)
 318         return 0;
 319
 320     if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
 321         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 322         goto err;
 323     }
 324
 325     /* get a and b */
 326     if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
 327         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 328         goto err;
 329     }
 330
 331     /*
 332      * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
 333      * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
 334      * definition of how to encode the field elements.
 335      */
 336     len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
 337     if ((a_buf = OPENSSL_malloc(len)) == NULL
 338         || (b_buf = OPENSSL_malloc(len)) == NULL)
 339         goto err;
 340     if (BN_bn2binpad(tmp_1, a_buf, len) < 0
 341         || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
 342         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 343         goto err;
 344     }
 345
 346     /* set a and b */
 347     if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
 348         || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
 349         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 350         goto err;
 351     }
 352
 353     /* set the seed (optional) */
 354     if (group->seed) {
 355         if (!curve->seed)
 356             if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
 357                 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 358                 goto err;
 359             }
 360         ossl_asn1_string_set_bits_left(curve->seed, 0);
 361         if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
 362                                  (int)group->seed_len)) {
 363             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 364             goto err;
 365         }
 366     } else {
 367         ASN1_BIT_STRING_free(curve->seed);
 368         curve->seed = NULL;
 369     }
 370
 371     ok = 1;
 372
 373  err:
 374     OPENSSL_free(a_buf);
 375     OPENSSL_free(b_buf);
 376     BN_free(tmp_1);
 377     BN_free(tmp_2);
 378     return ok;
 379 }
 380
 381 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
 382                                         ECPARAMETERS *params)
 383 {
 384     size_t len = 0;
 385     ECPARAMETERS *ret = NULL;
 386     const BIGNUM *tmp;
 387     unsigned char *buffer = NULL;
 388     const EC_POINT *point = NULL;
 389     point_conversion_form_t form;
 390     ASN1_INTEGER *orig;
 391
 392     if (params == NULL) {
 393         if ((ret = ECPARAMETERS_new()) == NULL) {
 394             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 395             goto err;
 396         }
 397     } else
 398         ret = params;
 399
 400     /* set the version (always one) */
 401     ret->version = (long)0x1;
 402
 403     /* set the fieldID */
 404     if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
 405         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 406         goto err;
 407     }
 408
 409     /* set the curve */
 410     if (!ec_asn1_group2curve(group, ret->curve)) {
 411         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 412         goto err;
 413     }
 414
 415     /* set the base point */
 416     if ((point = EC_GROUP_get0_generator(group)) == NULL) {
 417         ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
 418         goto err;
 419     }
 420
 421     form = EC_GROUP_get_point_conversion_form(group);
 422
 423     len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
 424     if (len == 0) {
 425         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 426         goto err;
 427     }
 428     if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
 429         OPENSSL_free(buffer);
 430         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 431         goto err;
 432     }
 433     ASN1_STRING_set0(ret->base, buffer, len);
 434
 435     /* set the order */
 436     tmp = EC_GROUP_get0_order(group);
 437     if (tmp == NULL) {
 438         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 439         goto err;
 440     }
 441     ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
 442     if (ret->order == NULL) {
 443         ret->order = orig;
 444         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 445         goto err;
 446     }
 447
 448     /* set the cofactor (optional) */
 449     tmp = EC_GROUP_get0_cofactor(group);
 450     if (tmp != NULL) {
 451         ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
 452         if (ret->cofactor == NULL) {
 453             ret->cofactor = orig;
 454             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 455             goto err;
 456         }
 457     }
 458
 459     return ret;
 460
 461  err:
 462     if (params == NULL)
 463         ECPARAMETERS_free(ret);
 464     return NULL;
 465 }
 466
 467 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
 468                                             ECPKPARAMETERS *params)
 469 {
 470     int ok = 1, tmp;
 471     ECPKPARAMETERS *ret = params;
 472
 473     if (ret == NULL) {
 474         if ((ret = ECPKPARAMETERS_new()) == NULL) {
 475             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 476             return NULL;
 477         }
 478     } else {
 479         if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
 480             ASN1_OBJECT_free(ret->value.named_curve);
 481         else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
 482                  && ret->value.parameters != NULL)
 483             ECPARAMETERS_free(ret->value.parameters);
 484     }
 485
 486     if (EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE) {
 487         /*
 488          * use the asn1 OID to describe the elliptic curve parameters
 489          */
 490         tmp = EC_GROUP_get_curve_name(group);
 491         if (tmp) {
 492             ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
 493
 494             if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
 495                 ASN1_OBJECT_free(asn1obj);
 496                 ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
 497                 ok = 0;
 498             } else {
 499                 ret->type = ECPKPARAMETERS_TYPE_NAMED;
 500                 ret->value.named_curve = asn1obj;
 501             }
 502         } else
 503             /* we don't know the nid => ERROR */
 504             ok = 0;
 505     } else {
 506         /* use the ECPARAMETERS structure */
 507         ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
 508         if ((ret->value.parameters =
 509              EC_GROUP_get_ecparameters(group, NULL)) == NULL)
 510             ok = 0;
 511     }
 512
 513     if (!ok) {
 514         ECPKPARAMETERS_free(ret);
 515         return NULL;
 516     }
 517     return ret;
 518 }
 519
 520 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
 521 {
 522     int ok = 0, tmp;
 523     EC_GROUP *ret = NULL, *dup = NULL;
 524     BIGNUM *p = NULL, *a = NULL, *b = NULL;
 525     EC_POINT *point = NULL;
 526     long field_bits;
 527     int curve_name = NID_undef;
 528     BN_CTX *ctx = NULL;
 529
 530     if (params->fieldID == NULL
 531             || params->fieldID->fieldType == NULL
 532             || params->fieldID->p.ptr == NULL) {
 533         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 534         goto err;
 535     }
 536
 537     /*
 538      * Now extract the curve parameters a and b. Note that, although SEC 1
 539      * specifies the length of their encodings, historical versions of OpenSSL
 540      * encoded them incorrectly, so we must accept any length for backwards
 541      * compatibility.
 542      */
 543     if (params->curve == NULL
 544             || params->curve->a == NULL || params->curve->a->data == NULL
 545             || params->curve->b == NULL || params->curve->b->data == NULL) {
 546         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 547         goto err;
 548     }
 549     a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
 550     if (a == NULL) {
 551         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 552         goto err;
 553     }
 554     b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
 555     if (b == NULL) {
 556         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 557         goto err;
 558     }
 559
 560     /* get the field parameters */
 561     tmp = OBJ_obj2nid(params->fieldID->fieldType);
 562     if (tmp == NID_X9_62_characteristic_two_field)
 563 #ifdef OPENSSL_NO_EC2M
 564     {
 565         ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
 566         goto err;
 567     }
 568 #else
 569     {
 570         X9_62_CHARACTERISTIC_TWO *char_two;
 571
 572         char_two = params->fieldID->p.char_two;
 573
 574         field_bits = char_two->m;
 575         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 576             ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
 577             goto err;
 578         }
 579
 580         if ((p = BN_new()) == NULL) {
 581             ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 582             goto err;
 583         }
 584
 585         /* get the base type */
 586         tmp = OBJ_obj2nid(char_two->type);
 587
 588         if (tmp == NID_X9_62_tpBasis) {
 589             long tmp_long;
 590
 591             if (!char_two->p.tpBasis) {
 592                 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 593                 goto err;
 594             }
 595
 596             tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
 597
 598             if (!(char_two->m > tmp_long && tmp_long > 0)) {
 599                 ERR_raise(ERR_LIB_EC, EC_R_INVALID_TRINOMIAL_BASIS);
 600                 goto err;
 601             }
 602
 603             /* create the polynomial */
 604             if (!BN_set_bit(p, (int)char_two->m))
 605                 goto err;
 606             if (!BN_set_bit(p, (int)tmp_long))
 607                 goto err;
 608             if (!BN_set_bit(p, 0))
 609                 goto err;
 610         } else if (tmp == NID_X9_62_ppBasis) {
 611             X9_62_PENTANOMIAL *penta;
 612
 613             penta = char_two->p.ppBasis;
 614             if (penta == NULL) {
 615                 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 616                 goto err;
 617             }
 618
 619             if (!
 620                 (char_two->m > penta->k3 && penta->k3 > penta->k2
 621                  && penta->k2 > penta->k1 && penta->k1 > 0)) {
 622                 ERR_raise(ERR_LIB_EC, EC_R_INVALID_PENTANOMIAL_BASIS);
 623                 goto err;
 624             }
 625
 626             /* create the polynomial */
 627             if (!BN_set_bit(p, (int)char_two->m))
 628                 goto err;
 629             if (!BN_set_bit(p, (int)penta->k1))
 630                 goto err;
 631             if (!BN_set_bit(p, (int)penta->k2))
 632                 goto err;
 633             if (!BN_set_bit(p, (int)penta->k3))
 634                 goto err;
 635             if (!BN_set_bit(p, 0))
 636                 goto err;
 637         } else if (tmp == NID_X9_62_onBasis) {
 638             ERR_raise(ERR_LIB_EC, EC_R_NOT_IMPLEMENTED);
 639             goto err;
 640         } else {                /* error */
 641
 642             ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 643             goto err;
 644         }
 645
 646         /* create the EC_GROUP structure */
 647         ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
 648     }
 649 #endif
 650     else if (tmp == NID_X9_62_prime_field) {
 651         /* we have a curve over a prime field */
 652         /* extract the prime number */
 653         if (params->fieldID->p.prime == NULL) {
 654             ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 655             goto err;
 656         }
 657         p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
 658         if (p == NULL) {
 659             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 660             goto err;
 661         }
 662
 663         if (BN_is_negative(p) || BN_is_zero(p)) {
 664             ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
 665             goto err;
 666         }
 667
 668         field_bits = BN_num_bits(p);
 669         if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
 670             ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
 671             goto err;
 672         }
 673
 674         /* create the EC_GROUP structure */
 675         ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 676     } else {
 677         ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
 678         goto err;
 679     }
 680
 681     if (ret == NULL) {
 682         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 683         goto err;
 684     }
 685
 686     /* extract seed (optional) */
 687     if (params->curve->seed != NULL) {
 688         /*
 689          * This happens for instance with
 690          * fuzz/corpora/asn1/65cf44e85614c62f10cf3b7a7184c26293a19e4a
 691          * and causes the OPENSSL_malloc below to choke on the
 692          * zero length allocation request.
 693          */
 694         if (params->curve->seed->length == 0) {
 695             ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 696             goto err;
 697         }
 698         OPENSSL_free(ret->seed);
 699         if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL)
 700             goto err;
 701         memcpy(ret->seed, params->curve->seed->data,
 702                params->curve->seed->length);
 703         ret->seed_len = params->curve->seed->length;
 704     }
 705
 706     if (params->order == NULL
 707             || params->base == NULL
 708             || params->base->data == NULL
 709             || params->base->length == 0) {
 710         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 711         goto err;
 712     }
 713
 714     if ((point = EC_POINT_new(ret)) == NULL)
 715         goto err;
 716
 717     /* set the point conversion form */
 718     EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
 719                                        (params->base->data[0] & ~0x01));
 720
 721     /* extract the ec point */
 722     if (!EC_POINT_oct2point(ret, point, params->base->data,
 723                             params->base->length, NULL)) {
 724         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 725         goto err;
 726     }
 727
 728     /* extract the order */
 729     if (ASN1_INTEGER_to_BN(params->order, a) == NULL) {
 730         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 731         goto err;
 732     }
 733     if (BN_is_negative(a) || BN_is_zero(a)) {
 734         ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
 735         goto err;
 736     }
 737     if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
 738         ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
 739         goto err;
 740     }
 741
 742     /* extract the cofactor (optional) */
 743     if (params->cofactor == NULL) {
 744         BN_free(b);
 745         b = NULL;
 746     } else if (ASN1_INTEGER_to_BN(params->cofactor, b) == NULL) {
 747         ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
 748         goto err;
 749     }
 750     /* set the generator, order and cofactor (if present) */
 751     if (!EC_GROUP_set_generator(ret, point, a, b)) {
 752         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 753         goto err;
 754     }
 755
 756     /*
 757      * Check if the explicit parameters group just created matches one of the
 758      * built-in curves.
 759      *
 760      * We create a copy of the group just built, so that we can remove optional
 761      * fields for the lookup: we do this to avoid the possibility that one of
 762      * the optional parameters is used to force the library into using a less
 763      * performant and less secure EC_METHOD instead of the specialized one.
 764      * In any case, `seed` is not really used in any computation, while a
 765      * cofactor different from the one in the built-in table is just
 766      * mathematically wrong anyway and should not be used.
 767      */
 768     if ((ctx = BN_CTX_new()) == NULL) {
 769         ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
 770         goto err;
 771     }
 772     if ((dup = EC_GROUP_dup(ret)) == NULL
 773             || EC_GROUP_set_seed(dup, NULL, 0) != 1
 774             || !EC_GROUP_set_generator(dup, point, a, NULL)) {
 775         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 776         goto err;
 777     }
 778     if ((curve_name = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
 779         /*
 780          * The input explicit parameters successfully matched one of the
 781          * built-in curves: often for built-in curves we have specialized
 782          * methods with better performance and hardening.
 783          *
 784          * In this case we replace the `EC_GROUP` created through explicit
 785          * parameters with one created from a named group.
 786          */
 787         EC_GROUP *named_group = NULL;
 788
 789 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
 790         /*
 791          * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
 792          * the same curve, we prefer the SECP nid when matching explicit
 793          * parameters as that is associated with a specialized EC_METHOD.
 794          */
 795         if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
 796             curve_name = NID_secp224r1;
 797 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
 798
 799         if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
 800             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 801             goto err;
 802         }
 803         EC_GROUP_free(ret);
 804         ret = named_group;
 805
 806         /*
 807          * Set the flag so that EC_GROUPs created from explicit parameters are
 808          * serialized using explicit parameters by default.
 809          */
 810         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 811
 812         /*
 813          * If the input params do not contain the optional seed field we make
 814          * sure it is not added to the returned group.
 815          *
 816          * The seed field is not really used inside libcrypto anyway, and
 817          * adding it to parsed explicit parameter keys would alter their DER
 818          * encoding output (because of the extra field) which could impact
 819          * applications fingerprinting keys by their DER encoding.
 820          */
 821         if (params->curve->seed == NULL) {
 822             if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
 823                 goto err;
 824         }
 825     }
 826
 827     ok = 1;
 828
 829  err:
 830     if (!ok) {
 831         EC_GROUP_free(ret);
 832         ret = NULL;
 833     }
 834     EC_GROUP_free(dup);
 835
 836     BN_free(p);
 837     BN_free(a);
 838     BN_free(b);
 839     EC_POINT_free(point);
 840
 841     BN_CTX_free(ctx);
 842
 843     return ret;
 844 }
 845
 846 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
 847 {
 848     EC_GROUP *ret = NULL;
 849     int tmp = 0;
 850
 851     if (params == NULL) {
 852         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
 853         return NULL;
 854     }
 855
 856     if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
 857         /* the curve is given by an OID */
 858         tmp = OBJ_obj2nid(params->value.named_curve);
 859         if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
 860             ERR_raise(ERR_LIB_EC, EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
 861             return NULL;
 862         }
 863         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
 864     } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
 865         /* the parameters are given by an ECPARAMETERS structure */
 866         ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
 867         if (!ret) {
 868             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 869             return NULL;
 870         }
 871         EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
 872     } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
 873         /* implicit parameters inherited from CA - unsupported */
 874         return NULL;
 875     } else {
 876         ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
 877         return NULL;
 878     }
 879
 880     return ret;
 881 }
 882
 883 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
 884
 885 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
 886 {
 887     EC_GROUP *group = NULL;
 888     ECPKPARAMETERS *params = NULL;
 889     const unsigned char *p = *in;
 890
 891     if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
 892         ECPKPARAMETERS_free(params);
 893         return NULL;
 894     }
 895
 896     if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
 897         ECPKPARAMETERS_free(params);
 898         return NULL;
 899     }
 900
 901     if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
 902         group->decoded_from_explicit_params = 1;
 903
 904     if (a) {
 905         EC_GROUP_free(*a);
 906         *a = group;
 907     }
 908
 909     ECPKPARAMETERS_free(params);
 910     *in = p;
 911     return group;
 912 }
 913
 914 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
 915 {
 916     int ret = 0;
 917     ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
 918     if (tmp == NULL) {
 919         ERR_raise(ERR_LIB_EC, EC_R_GROUP2PKPARAMETERS_FAILURE);
 920         return 0;
 921     }
 922     if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
 923         ERR_raise(ERR_LIB_EC, EC_R_I2D_ECPKPARAMETERS_FAILURE);
 924         ECPKPARAMETERS_free(tmp);
 925         return 0;
 926     }
 927     ECPKPARAMETERS_free(tmp);
 928     return ret;
 929 }
 930
 931 /* some EC_KEY functions */
 932
 933 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
 934 {
 935     EC_KEY *ret = NULL;
 936     EC_PRIVATEKEY *priv_key = NULL;
 937     const unsigned char *p = *in;
 938
 939     if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
 940         return NULL;
 941
 942     if (a == NULL || *a == NULL) {
 943         if ((ret = EC_KEY_new()) == NULL) {
 944             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 945             goto err;
 946         }
 947     } else
 948         ret = *a;
 949
 950     if (priv_key->parameters) {
 951         EC_GROUP_free(ret->group);
 952         ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
 953         if (ret->group != NULL
 954             && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
 955             ret->group->decoded_from_explicit_params = 1;
 956     }
 957
 958     if (ret->group == NULL) {
 959         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 960         goto err;
 961     }
 962
 963     ret->version = priv_key->version;
 964
 965     if (priv_key->privateKey) {
 966         ASN1_OCTET_STRING *pkey = priv_key->privateKey;
 967         if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
 968                             ASN1_STRING_length(pkey)) == 0)
 969             goto err;
 970     } else {
 971         ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
 972         goto err;
 973     }
 974
 975     if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
 976         EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
 977
 978     EC_POINT_clear_free(ret->pub_key);
 979     ret->pub_key = EC_POINT_new(ret->group);
 980     if (ret->pub_key == NULL) {
 981         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 982         goto err;
 983     }
 984
 985     if (priv_key->publicKey) {
 986         const unsigned char *pub_oct;
 987         int pub_oct_len;
 988
 989         pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
 990         pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
 991         if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
 992             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
 993             goto err;
 994         }
 995     } else {
 996         if (ret->group->meth->keygenpub == NULL
 997             || ret->group->meth->keygenpub(ret) == 0)
 998                 goto err;
 999         /* Remember the original private-key-only encoding. */
1000         ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1001     }
1002
1003     if (a)
1004         *a = ret;
1005     EC_PRIVATEKEY_free(priv_key);
1006     *in = p;
1007     ret->dirty_cnt++;
1008     return ret;
1009
1010  err:
1011     if (a == NULL || *a != ret)
1012         EC_KEY_free(ret);
1013     EC_PRIVATEKEY_free(priv_key);
1014     return NULL;
1015 }
1016
1017 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1018 {
1019     int ret = 0, ok = 0;
1020     unsigned char *priv= NULL, *pub= NULL;
1021     size_t privlen = 0, publen = 0;
1022
1023     EC_PRIVATEKEY *priv_key = NULL;
1024
1025     if (a == NULL || a->group == NULL ||
1026         (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1027         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1028         goto err;
1029     }
1030
1031     if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1032         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1033         goto err;
1034     }
1035
1036     priv_key->version = a->version;
1037
1038     privlen = EC_KEY_priv2buf(a, &priv);
1039
1040     if (privlen == 0) {
1041         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1042         goto err;
1043     }
1044
1045     ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1046     priv = NULL;
1047
1048     if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1049         if ((priv_key->parameters =
1050              EC_GROUP_get_ecpkparameters(a->group,
1051                                         priv_key->parameters)) == NULL) {
1052             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1053             goto err;
1054         }
1055     }
1056
1057     if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1058         priv_key->publicKey = ASN1_BIT_STRING_new();
1059         if (priv_key->publicKey == NULL) {
1060             ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
1061             goto err;
1062         }
1063
1064         publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1065
1066         if (publen == 0) {
1067             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1068             goto err;
1069         }
1070
1071         ossl_asn1_string_set_bits_left(priv_key->publicKey, 0);
1072         ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1073         pub = NULL;
1074     }
1075
1076     if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1077         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1078         goto err;
1079     }
1080     ok = 1;
1081  err:
1082     OPENSSL_clear_free(priv, privlen);
1083     OPENSSL_free(pub);
1084     EC_PRIVATEKEY_free(priv_key);
1085     return (ok ? ret : 0);
1086 }
1087
1088 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1089 {
1090     if (a == NULL) {
1091         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1092         return 0;
1093     }
1094     return i2d_ECPKParameters(a->group, out);
1095 }
1096
1097 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1098 {
1099     EC_KEY *ret;
1100
1101     if (in == NULL || *in == NULL) {
1102         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1103         return NULL;
1104     }
1105
1106     if (a == NULL || *a == NULL) {
1107         if ((ret = EC_KEY_new()) == NULL) {
1108             ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1109             return NULL;
1110         }
1111     } else
1112         ret = *a;
1113
1114     if (!d2i_ECPKParameters(&ret->group, in, len)) {
1115         if (a == NULL || *a != ret)
1116              EC_KEY_free(ret);
1117         else
1118             ret->dirty_cnt++;
1119         return NULL;
1120     }
1121
1122     if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
1123         EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
1124
1125     ret->dirty_cnt++;
1126
1127     if (a)
1128         *a = ret;
1129
1130     return ret;
1131 }
1132
1133 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1134 {
1135     EC_KEY *ret = NULL;
1136
1137     if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1138         /*
1139          * sorry, but a EC_GROUP-structure is necessary to set the public key
1140          */
1141         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1142         return 0;
1143     }
1144     ret = *a;
1145     /* EC_KEY_opt2key updates dirty_cnt */
1146     if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1147         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1148         return 0;
1149     }
1150     *in += len;
1151     return ret;
1152 }
1153
1154 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1155 {
1156     size_t buf_len = 0;
1157     int new_buffer = 0;
1158
1159     if (a == NULL) {
1160         ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1161         return 0;
1162     }
1163
1164     buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1165                                  a->conv_form, NULL, 0, NULL);
1166
1167     if (out == NULL || buf_len == 0)
1168         /* out == NULL => just return the length of the octet string */
1169         return buf_len;
1170
1171     if (*out == NULL) {
1172         if ((*out = OPENSSL_malloc(buf_len)) == NULL)
1173             return 0;
1174         new_buffer = 1;
1175     }
1176     if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1177                             *out, buf_len, NULL)) {
1178         ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1179         if (new_buffer) {
1180             OPENSSL_free(*out);
1181             *out = NULL;
1182         }
1183         return 0;
1184     }
1185     if (!new_buffer)
1186         *out += buf_len;
1187     return buf_len;
1188 }
1189
1190 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1191 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1192
1193 #endif /* FIPS_MODULE */
1194
1195 ECDSA_SIG *ECDSA_SIG_new(void)
1196 {
1197     ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1198
1199     return sig;
1200 }
1201
1202 void ECDSA_SIG_free(ECDSA_SIG *sig)
1203 {
1204     if (sig == NULL)
1205         return;
1206     BN_clear_free(sig->r);
1207     BN_clear_free(sig->s);
1208     OPENSSL_free(sig);
1209 }
1210
1211 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1212 {
1213     ECDSA_SIG *sig;
1214
1215     if (len < 0)
1216         return NULL;
1217     if (psig != NULL && *psig != NULL) {
1218         sig = *psig;
1219     } else {
1220         sig = ECDSA_SIG_new();
1221         if (sig == NULL)
1222             return NULL;
1223     }
1224     if (sig->r == NULL)
1225         sig->r = BN_new();
1226     if (sig->s == NULL)
1227         sig->s = BN_new();
1228     if (sig->r == NULL || sig->s == NULL
1229         || ossl_decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1230         if (psig == NULL || *psig == NULL)
1231             ECDSA_SIG_free(sig);
1232         return NULL;
1233     }
1234     if (psig != NULL && *psig == NULL)
1235         *psig = sig;
1236     return sig;
1237 }
1238
1239 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1240 {
1241     BUF_MEM *buf = NULL;
1242     size_t encoded_len;
1243     WPACKET pkt;
1244
1245     if (ppout == NULL) {
1246         if (!WPACKET_init_null(&pkt, 0))
1247             return -1;
1248     } else if (*ppout == NULL) {
1249         if ((buf = BUF_MEM_new()) == NULL
1250                 || !WPACKET_init_len(&pkt, buf, 0)) {
1251             BUF_MEM_free(buf);
1252             return -1;
1253         }
1254     } else {
1255         if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1256             return -1;
1257     }
1258
1259     if (!ossl_encode_der_dsa_sig(&pkt, sig->r, sig->s)
1260             || !WPACKET_get_total_written(&pkt, &encoded_len)
1261             || !WPACKET_finish(&pkt)) {
1262         BUF_MEM_free(buf);
1263         WPACKET_cleanup(&pkt);
1264         return -1;
1265     }
1266
1267     if (ppout != NULL) {
1268         if (*ppout == NULL) {
1269             *ppout = (unsigned char *)buf->data;
1270             buf->data = NULL;
1271             BUF_MEM_free(buf);
1272         } else {
1273             *ppout += encoded_len;
1274         }
1275     }
1276
1277     return (int)encoded_len;
1278 }
1279
1280 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1281 {
1282     if (pr != NULL)
1283         *pr = sig->r;
1284     if (ps != NULL)
1285         *ps = sig->s;
1286 }
1287
1288 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1289 {
1290     return sig->r;
1291 }
1292
1293 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1294 {
1295     return sig->s;
1296 }
1297
1298 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1299 {
1300     if (r == NULL || s == NULL)
1301         return 0;
1302     BN_clear_free(sig->r);
1303     BN_clear_free(sig->s);
1304     sig->r = r;
1305     sig->s = s;
1306     return 1;
1307 }
1308
1309 int ECDSA_size(const EC_KEY *ec)
1310 {
1311     int ret;
1312     ECDSA_SIG sig;
1313     const EC_GROUP *group;
1314     const BIGNUM *bn;
1315
1316     if (ec == NULL)
1317         return 0;
1318     group = EC_KEY_get0_group(ec);
1319     if (group == NULL)
1320         return 0;
1321
1322     bn = EC_GROUP_get0_order(group);
1323     if (bn == NULL)
1324         return 0;
1325
1326     sig.r = sig.s = (BIGNUM *)bn;
1327     ret = i2d_ECDSA_SIG(&sig, NULL);
1328
1329     if (ret < 0)
1330         ret = 0;
1331     return ret;
1332 }